There are certainly lots of choices out there. I have a Vetta wireless computer that has heart rate and cadence and love it! Although it's only used on the bike.

I've had lots of people buy monitors the shop trainer classes the past few years, and it certainly depends on what you want it for. I will say that the computers that feature calories used aren't terribly accurate.(IME) I've sold a lot of Sigma computers, the PC-9 offers zones where you program in where you want your heart rate to be for a specific workout and if you get above or below that it will beep to let you know. It's fairly inexpensive $65-$75 depending on where you look. And the important thing is that there have not been any problems with any of them.

Good luck in your search!